plutonic

adjective
plu·​ton·​ic | \plü-ˈtä-nik \

Definition of plutonic 

1 : formed by solidification of magma deep within the earth and crystalline throughout plutonic rock

2 often capitalized : plutonian

First Known Use of plutonic

1596, in the meaning defined at sense 2

History and Etymology for plutonic

Latin Pluton-, Pluto

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The first known use of plutonic was in 1596

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